Usain Bolt is still unsure if he will participate in the 100 metres race at the Beijing Olympics despite clocking 9.76 seconds over the distance, the Jamaican 200 metres specialist said on Monday.

"My coach and I are going to decide what would be best for me," the world 200 metres silver medallist told Reuters in a telephone interview from Kingston, Jamaica, a day after dashing to the second-fastest 100 metres of all-time in Sunday's Jamaica International Invitational.

"Tomorrow (Tuesday) we will be talking more about that, so I really cannot answer that right now," added Bolt, who finished two-hundredths of a second outside of countryman Asafa Powell's world record of 9.74 seconds.

The lanky 21-year-old produced the stunning performance in only his third 100 metres as a professional.

"I was not expecting that," said Bolt, who previous personal best was 10.03 seconds.

But after a less than impressive start, he roared away from the field for an easy victory.

"My 200 metres speed started to kick in after about 50 metres, and I just went away from the pack," said Bolt, who enjoyed a favourable wind of 1.8 metres per second.

"It was fantastic," said his trainer of four years, Glen Mills.

"In terms of ability, Usain has the most of any athlete I have ever coached and probably have ever seen," Mills told Reuters via telephone from Kingston.

But Bolt said he was not ready to predict he would some day break Powell's record.

"I am not worried about that right now," he said. "I just want to enjoy the moment.

"I really don't know how fast I can run the 100. I'll just wait until after my next race before I say anything."

At least four more 100 metres are on his schedule before the late June Jamaican Olympic trials, he said, including one in Trinidad later this month.

His opening 200 metres will take place in Ostrava on June 12, the world junior record holder said.

Mills said Bolt definitely would run the 200 metres at the Jamaican trials, but any decision on the 100 will not come until after an analysis of how other world-class sprinters are doing in the short race.

Initially, they were planning to use the 100 as speed work for the 200, the coach said. Now the door could be open for a double.

"The results (in training for the 100) have been amazing, so I was expecting him to put up a big performance," said Mills, who also coaches former 100 metres world champion Kim Collins of St. Kitts.

"But it is early in the season, and a lot of the top performers have not come out and run.

"By the time the American trials come around (in late June) we should pretty much have a good idea about the realities of going to the Olympics (in the 100)."

The Olympics run from Aug 8-24.

TVNZ is the official broadcast and internet partner for the 2008 Beijing Olympics